MPI MPXpress

MPI MPXpress


MPI MPXpress

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MPXpress is a series of diesel-electric passenger train locomotives designed for commuter rail service. The manufacturer, Motive Power, offers the locomotives with a number of customizable options such as different prime mover and traction motors, head end power (HEP) generated by a separate engine or by the prime mover, and new or refurbished trucks. To date, MPI has offered three main variants: MP36PH-3S, MP36PH-3C, and MP40PH-3C.

The MPXpress line of locomotives were the first production passenger locomotives to meet EPA Tier 1 and Tier 2 emissions regulations, as well as FRA safety regulations regarding crashworthiness and fire safety. The line also meets APTA crashworthiness standards.

Numerous public transit agencies in Canada and the United States have ordered MPXpress locomotives for their commuter rail services.



The MP36PH-3S uses a 16-cylinder MPI 645F3B diesel engine as its prime mover. Its HEP is generated from a static inverter that receives its power through connections to the prime mover — hence the "S" (static) designation. When providing full electrical power to the passenger cars connected to it, the prime mover must maintain a higher RPM in order to supply power to the passenger cars. The traction power when providing full HEP load of 500 kW is 2930 HP, since HEP generation diverts some power from the prime mover.

Chicago's Metra has ordered 27 of these locomotives, which were built and delivered from 2003 through 2004. 14...
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